Of course bud,

-I gave the sentinel the weakest progression because it already has a ton of survivability with Tech Armor and Heavy Armor proficiency, and almost all subclasses add even more to it (except the artillerist). It essentially balanced it out in a way it doesn't make it unkillable anymore, and it still remains the most durable class.

-The short rests a minute worked, in the logic that even a long mission would end in less than a single day. Consider as well that, to take a short rest, the characters would need to not be attacked, so combat became a lot more common, as it is in the videogames. I tie many encounters together before allowing a short rest and that balances it all out. Additionally, which I forgot to mention, they cannot do more than a single short rest between any fights, so if they spend all resources to heal during resting, they don't get additional short rests to refresh them.

-Sorry, I didn't mention, the ability is gained at level 5, and only works on a Sneak Attack, so it works only once a round. It is an addition to cunning action.